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@andrew health_and_safety flash_onAdmin
The Elasmotherium existed as many as 29,000 years ago (here on Earth, even though it certainly doesn't look native to our planet!).
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Their massive horns require huge muscles in their back, as you can see from the hump jutting out. Taking a look at their skeleton also shows support in the form of bones:
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Here's a size comparison chart as well (but unfortunately doesn't show the horn), with humans in the bottom left for size reference:
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You can read more about this "thin plate beast" on Wikipedia:
Saw this on reddit and thought it was way too cool/inspiring not to share.